CRN_01 swabs are a response to shortages of supplies during Covid-19 pandemic. The aim was to simplify their manufacturing, allowing for local production. Nowadays, the swabs are made in two stages: injection molded and flocked. The CRN_01 has a one-step production, easier and cheaper. Made from a single material, they can be easily recycled and thus represent the previously unavailable circular approach. In the spirit of biomimetics the form of the swab was inspired by the hummingbird's tongue.